You can replace the chamber sensor, or try to get this issue resolved under warranty. I assume it's a Rheem unit but I don't know without the model number. In any case you would need to contact the manufacturer to try and start a warranty claim.. Hot water heater sensors are not immune to failure. This water heater manual mentions heat sensors. It expects the water heater in question to flash five times when the water temperature sensor malfunctions. They also expect the consumer to respond by replacing the thermostat or gas control valve. This tells you that water heater sensors can fail.
:max_bytes(150000):strip_icc()/replacing-water-heater-thermocouple-flame-sensor-1824918-hero-7ee1bb61d2a84355b3884424297996b4.jpg "How to Replace a Water Heater Thermocouple or Flame Sensor")
Now, you know everything there is to know about the Rheem water heater chamber sensor failure & 9 flashes issue. You can now diagnose the issue and take corrective steps. At times, cleaning the sensor will be enough. During other times, you'll have to replace it. Hopefully, this guide will help you in solving your problem correctly and quickly.. Product details page for CHAMBER SENSOR REPLACEMENT KIT ULN SELF-POWERED 16, 18, 20 IN is loaded.